Schneider Electric LC1DWK12M7 — 63 kVAR Capacitor Contactor Guide

By Abdullah Zahid
14 min read
Schneider Electric LC1DWK12M7 TeSys Deca capacitor contactor 63 kVAR 400V DIN rail mounted in industrial power factor correction panel

Schneider Electric LC1DWK12M7 Capacitor Contactor: 63 kVAR at 400V/415V — Specs, Selection Guide and Alternatives

If you are specifying or replacing a switching device for a three-phase capacitor bank on a 400V industrial system, the Schneider Electric LC1DWK12M7 is likely already on your shortlist. This TeSys Deca capacitor contactor is rated at 63 kVAR at 400/415V 50Hz with a 220V AC 50/60Hz coil, uses screw clamp terminals, and mounts on standard DIN rail — making it a direct fit for the vast majority of mid-range power factor correction panels. The single most important thing to confirm before ordering: your available control supply must be 220V AC. Mismatch there will stop the project cold.

If you have already confirmed this is the right part, check current pricing and availability for the LC1DWK12M7 at LeadTime.ca — ships worldwide.

Who Should Buy the LC1DWK12M7 — and Who Should Not

The LC1DWK12M7 is the right contactor for facilities running a 400V three-phase supply with motor loads in the 200–600 kW range where a 63 kVAR capacitor bank is already installed or specified. It is equally well-suited for system integrators and OEM panel builders standardizing on the Schneider Electric TeSys platform for repeatable power factor correction builds.

  • Your capacitor bank nameplate reads 63 kVAR or less at 400V — the contactor must not be undersized for the bank it switches
  • Your control circuit supplies 220V AC at 50Hz or 60Hz — this model has no DC coil option and no 110V AC version under this catalog number
  • Your power system nominal voltage sits within the 690V AC maximum rating of this contactor — suitable for 208V, 277V, 347V, 400V, and 480V systems
  • You require an AC-6b rated contact configuration — the correct operating category for capacitive and reactive loads, not AC-3 or AC-4 motor duty
  • You need DIN rail mounting in a standard industrial enclosure — the compact TeSys Deca form factor fits alongside other TeSys components without panel redesign

If your control supply is 110V AC or 24V DC, or if your capacitor bank is rated below 35 kVAR or above 80 kVAR, this is not your model. The TeSys LC1D family includes variants with alternate coil voltages and kVAR ratings — see the comparison table below for specific alternatives.

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What the LC1DWK12M7 Does in a Power Factor Correction System

The LC1DWK12M7 is a single-function switching device: it connects and disconnects a three-phase capacitor bank from the utility supply on command. That role sounds simple, but the electrical stress involved in switching capacitive loads is fundamentally different from switching induction motors — which is exactly why the AC-6b operating category exists. An AC-6b rated contactor is built with contact materials and pressure profiles optimized for the high inrush currents that flow the instant a capacitor bank is connected. An AC-3 motor contactor used in this role will experience accelerated contact erosion, welding, or outright failure within weeks to months of service.

The 63 kVAR rating at 400V/415V 50Hz places this contactor squarely in the mid-range industrial segment. The same TeSys Deca physical form factor covers a range of kVAR capacities — but the LC1DWK12M7 specifically targets the 200–600 kW motor load bracket, which represents the most common industrial power factor correction retrofit scenario. The 220V AC 50/60Hz coil draws from a separate control transformer or UPS output; the coil supply is entirely independent of the three-phase power circuit, which is standard practice in industrial control design.

Three normally open (NO) contacts switch all three phases simultaneously when the coil energizes. There are no integrated auxiliary contacts on the base model, and there is no integrated circuit breaker — an upstream protection device must be provided separately, as confirmed in Schneider Electric's official documentation for this product family.

Typical System Architecture for Capacitor Bank Switching

The LC1DWK12M7 sits between the facility's main distribution bus and the capacitor bank, acting as the controlled isolation point for reactive power compensation. Here is how it fits into a typical installation:

  • Utility or main distribution panel (400V three-phase) feeds upstream through a dedicated circuit breaker or fused disconnect — required external protection for this contactor
  • Three-phase conductors (L1, L2, L3) land on the contactor's power input screw clamp terminals
  • The LC1DWK12M7 output terminals (T1, T2, T3) connect directly to the capacitor bank input
  • A 220V AC control supply — derived from a control transformer or UPS output — energizes the coil via terminals A1 and A2, typically via a power factor correction controller or timing relay
  • When the PFC controller signals reactive power is needed, the coil closes all three NO contacts simultaneously, connecting the 63 kVAR bank to the live system

Where the LC1DWK12M7 Gets Deployed

Power factor correction systems appear in nearly every sector of heavy and light industry, and the 63 kVAR rating of the LC1DWK12M7 covers the scenarios that appear most frequently in retrofit and new-build projects alike.

In industrial manufacturing facilities running 400V three-phase supplies, the most common deployment is a retrofit of an aging or failed capacitor switching relay. The LC1DWK12M7 replaces the existing switching device with a properly rated AC-6b contactor, restoring reliable reactive power compensation without electrical panel redesign.

Commercial HVAC systems with large chillers and air handling units generate significant reactive loads that vary through the day. Demand-responsive capacitor switching — where the contactor cycles in and out based on instantaneous power factor readings — is a natural fit for the LC1DWK12M7's rated switching endurance under AC-6b duty.

Variable-load industrial environments such as sawmills, textile plants, and food processing facilities with fluctuating motor loads benefit from incremental capacitor bank expansion. When a second bank is added to an existing power factor correction array, a new LC1DWK12M7 is the standard addition for the incremental 63 kVAR stage.

UPS and backup power systems that use capacitor banks for output filtering or ride-through also use this contactor as the isolation device, with the 220V AC coil supplied directly from the UPS output — a clean, stable control source that suits the coil's operating requirements.

Application Typical Deployment
400V industrial manufacturing retrofit Replacing failed electromechanical relay in existing PFC panel; drop-in TeSys Deca replacement
Commercial HVAC power factor correction Demand-responsive capacitor switching on chiller or AHU distribution; PFC controller drives coil
Incremental capacitor bank expansion Second contactor added to multi-stage PFC array; each stage independently switched at 63 kVAR
UPS output capacitor isolation 220V AC coil supplied from UPS output; capacitor bank connects on restoration of clean power
Variable-load industrial (sawmill, textile) Hourly reactive power fluctuation managed by timed switching cycles; AC-6b rating handles inrush stress
New industrial plant electrical design Specified as part of original electrical design for scalable PFC; DIN rail form factor fits standard MCC

Purchase-Decision Specifications at a Glance

Parameter Value Notes
Rated Capacity at 400/415V 50Hz 63 kVAR Primary application voltage; capacitor bank must not exceed this rating
Rated Capacity at 230V 50Hz 35 kVAR Lower voltage rating within same contactor
Rated Capacity at 440V 50Hz 67 kVAR Higher voltage sites; verify system voltage before specifying
Maximum Circuit Voltage 690V AC 50/60Hz Absolute maximum; suitable for 208V, 277V, 347V, 400V, 480V systems
Control Coil Voltage 220V AC 50/60Hz Separate supply required; no DC variant under this model number
Operating Category AC-6b Capacitive and resistive loads only; do not substitute for AC-3 motor duty
Contact Configuration 3-pole, 3 NO All three phases normally open; no auxiliary contacts on base model
Terminal Type Screw clamp Manual termination; torque to manufacturer specification
Mounting Type DIN rail Standard 35mm DIN profile
Product Family TeSys LC1D.K / TeSys Deca Multiple kVAR and coil voltage variants available in same family

Full technical specifications are available on the product page at LeadTime.ca.

LC1DWK12M7 vs. Other TeSys Capacitor Contactor Variants — Which One Do You Actually Need?

Model Rated Capacity Coil Voltage Best For Lead Time Note
LC1DWK06M7 35 kVAR at 230V 220V AC Smaller systems, lower-voltage installations Typically in stock
LC1DWK09M7 50 kVAR at 400V 220V AC Medium industrial, HVAC with moderate reactive load Typically in stock
LC1DWK12M7 63 kVAR at 400V 220V AC Standard mid-range — this model 1–2 week typical
LC1DWK15M7 80–100 kVAR at 400V 220V AC Large industrial plants, 400–600+ kW motor loads May require lead time
LC1DWK**C7 variants Various 24V AC or 110V AC Low-voltage control circuits; facilities without 220V AC control Specify coil voltage when ordering

If your capacitor bank exceeds 63 kVAR or your motor load sits above 600 kW, the LC1DWK15M7 is the correct step up — check current availability and confirm the right variant at LeadTime.ca.

Expert Verdict: Is This the Right Contactor for Your Project?

The LC1DWK12M7 is a proven, straightforward choice for anyone switching a 63 kVAR three-phase capacitor bank on a 400V/415V 50Hz industrial or commercial power system. The AC-6b contact rating is the critical differentiator — it is specifically validated for the inrush and rapid make/break cycles that capacitor bank switching demands, which means you are not improvising with a motor contactor and hoping the contacts last. The 220V AC coil integrates directly into standard industrial control circuits fed by a control transformer or UPS, and the screw clamp DIN rail format drops into most existing panel layouts without modification. The buyer this part is designed for is the controls engineer or facilities maintenance lead managing a 400V three-phase plant with motor loads in the 200–600 kW range, whether on a retrofit project or a new build, and whether sourcing one unit or building out a multi-stage PFC array.

Where the LC1DWK12M7 is not the right answer: if your control supply is 110V AC or 24V DC, order the appropriate coil voltage variant from the TeSys LC1D family — do not attempt to adapt the control circuit to match this coil. If your capacitor bank is rated above 63 kVAR, move up to the LC1DWK15M7. If the bank is smaller than 35 kVAR, consider the LC1DWK06M7 instead of oversizing. And if your application is motor starting rather than capacitor switching, the LC1DWK12M7's AC-6b rating is the wrong operating category entirely — an AC-3 contactor is what you need, and using an AC-6b contactor for motor duty is an unnecessary cost without any functional benefit.

From a procurement standpoint, the LC1DWK12M7 is part of Schneider Electric's core TeSys Deca line and is stocked by major authorized distributors, with typical lead times of 1–2 weeks when in stock and 2–4 weeks if a backorder is required. The key reason to buy through a specialist distributor rather than a generic online channel is technical verification: a single wrong coil voltage on the order confirmation can delay a power factor correction project by two weeks and negate any savings from a cheaper channel. View current stock status and pricing for the LC1DWK12M7 at LeadTime.ca — we ship worldwide and can confirm lead time before you commit to a build schedule.

For volume pricing, multi-unit orders, or to confirm current lead time before locking in a project schedule, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the LC1DWK12M7

Community-level discussion specific to the LC1DWK12M7 by catalog number is limited — this is a specialized industrial component with a narrower addressable audience than general-purpose contactors or programmable controllers. What does exist in the broader TeSys capacitor contactor space, and what experienced integrators consistently flag, are a small set of recurring specification errors that cause the majority of wrong-part orders and field installation problems. These are not theoretical concerns; they are the real-world traps that cause a project to stall while a return authorization is processed and the correct part ships.

The most frequently reported ordering mistake across the TeSys capacitor contactor family is coil voltage mismatch. The LC1DWK12M7 model number does not visibly encode the coil voltage — that information lives in the full product descriptor and the datasheet. Buyers who skim the listing, or who assume their facility's control supply is 220V AC without physically verifying it, arrive on-site with a contactor that either flutters or fails to pull in. Facilities built before widespread adoption of 220V control standards frequently have only 110V AC available. The fix is simple — verify the control transformer secondary or UPS output voltage with a multimeter before the purchase order is issued — but skipping that step is costly.

The second area where specialist advice pays for itself is AC category confusion. The TeSys family includes both motor-duty contactors (AC-3, AC-4) and capacitor-duty contactors (AC-6b), and they occupy similar physical footprints. An engineer specifying a replacement contactor for a power factor correction panel who is not fluent in IEC operating categories may pull the wrong TeSys model from a distributor catalog. The LC1DWK12M7 is explicitly AC-6b rated — confirmed in Schneider Electric's official product documentation — which means its contact materials and pressure profiles are validated for capacitive inrush. Substituting an AC-3 motor contactor in this role will result in contact erosion or welding under service. When community feedback is sparse and the datasheet requires careful reading, the right move is to confirm your specification with a technical distributor before the order ships. That is precisely what the team at LeadTime.ca is positioned to do.

Wiring and Installation Overview

  • The power circuit uses three-phase screw clamp terminals (L1, L2, L3 input; T1, T2, T3 output to capacitor bank) — verify wire gauge against your circuit breaker amperage rating and local electrical code before terminating; torque all screw terminals to the manufacturer's specified value using a calibrated torque wrench
  • The control coil connects to terminals A1 (supply) and A2 (return) from a 220V AC 50/60Hz source — typically a control transformer secondary or UPS output; confirm supply voltage reads 220V AC ±10% at the terminals before energizing the coil
  • An upstream circuit breaker or fused disconnect is required in the power circuit — the LC1DWK12M7 does not include integrated overcurrent protection; this is confirmed in Schneider Electric's official documentation
  • If a VFD or soft-start drive is located nearby in the same enclosure, consider installing a suppression component across the coil terminals A1 and A2 to reduce transient voltage spikes and extend coil service life in electrically noisy environments
  • Mount on a standard 35mm DIN rail with adequate enclosure ventilation — the contactor is air-cooled passively; sealed or under-ventilated enclosures require thermal load calculations before installation

Full wiring diagrams, torque specifications, and commissioning procedures are available in the Schneider Electric TeSys Deca installation documentation. Engineers requiring step-by-step procedures should refer to the official manufacturer documentation for this product family.

Wrong-Part Checklist: Confirm These Six Points Before You Order

Run through every item on this checklist before submitting your purchase order. Each point corresponds to a real ordering or installation failure mode identified in Schneider Electric's documentation and distributor field experience.

  1. Verify available control voltage is 220V AC (50 or 60 Hz); confirm no DC supply is needed.
  2. Confirm capacitor bank nameplate kVAR does not exceed 63 kVAR; undersizing is acceptable, oversizing causes nuisance trips.
  3. Check power system nominal voltage: 400V-415V systems are primary target; verify 690V max rating is not exceeded by transients.
  4. Ensure DIN rail space and panel cooling allow contactor mounting without thermal stress.
  5. Confirm AC-6b (capacitive load) rating is required; do not confuse with AC-3 or AC-4 (induction motor) rated contactors.
  6. Verify lead time: check distributor stock before committing to order (Schneider products typically 1-2 week lead time if in stock).

If any item on this checklist raises a flag, contact the LeadTime.ca team before ordering — we can confirm the correct variant for your system and check current stock worldwide.

Frequently Asked Questions

Can the LC1DWK12M7 be used for motor starting duty?

No. The LC1DWK12M7 carries an AC-6b operating category rating, which is specific to capacitive and resistive load switching. Motor starting applications require an AC-3 or AC-4 rated contactor. Using an AC-6b contactor for motor duty is technically possible but unnecessarily expensive and the wrong tool for the application. More critically, using an AC-3 motor contactor for capacitor bank switching is dangerous — the contact design is not validated for capacitive inrush, and premature contact failure or welding will result.

What coil voltage options are available if 220V AC is not present in my facility?

The LC1DWK12M7 specifically has a 220V AC 50/60Hz coil — that is encoded in the M7 suffix of the model number. The TeSys LC1D family offers alternate coil voltages, including 24V AC and 110V AC options, under different catalog suffixes (for example, C7 variants). If your control circuit runs at 110V AC or 24V DC, request the corresponding model from the TeSys family rather than adapting the control supply to match this coil.

Does the LC1DWK12M7 include a circuit breaker or overcurrent protection?

No. The LC1DWK12M7 is a switching contactor only — it does not include integrated overcurrent protection or a circuit breaker. An external upstream protection device (circuit breaker or fused disconnect) is required in the power circuit. This is standard practice for industrial contactor installations and is confirmed in Schneider Electric's official product documentation for the TeSys Deca family.

What is the typical lead time, and is it available for international orders?

The LC1DWK12M7 is part of Schneider Electric's core TeSys Deca line and is stocked by major authorized distributors with a typical lead time of 1–2 weeks when in stock, and 2–4 weeks if a backorder is needed. These are market-typical estimates — verify current stock status with your distributor before committing to a project schedule. LeadTime.ca ships worldwide and can confirm real-time availability for international orders.

Is this contactor suitable for outdoor or wet-location installations?

The LC1DWK12M7 is designed for mounting inside a standard industrial electrical enclosure. The contactor itself does not carry an outdoor or ingress protection (IP) rating for direct exposure to weather or moisture. For outdoor installations, the contactor must be housed inside an appropriately rated enclosure (IP54 or higher depending on the environment). Consult Schneider Electric's installation guidelines and local electrical code for enclosure selection in wet or outdoor locations.

How do I confirm whether the screw clamp terminal version is correct for my installation, versus a spring clamp variant?

The LC1DWK12M7 uses screw clamp terminals — this is explicitly stated in the full official product descriptor ("screw clamp terminals") and confirmed in Schneider Electric's product documentation. If your installation requires push-in spring clamp termination for faster wiring or vibration-prone environments, consult the TeSys Deca family listings for the equivalent spring clamp variant. Do not assume terminal type from the model number alone; always verify the full product descriptor before ordering.

Why Order the LC1DWK12M7 from LeadTime.ca

  • Global shipping — LeadTime.ca sources and ships industrial automation components worldwide, with no single-region restriction
  • Technical pre-order verification — confirm coil voltage, kVAR rating, and terminal type with a knowledgeable team before the order ships, not after it arrives on-site
  • Hard-to-source stock visibility — access to distributor network inventory across multiple channels reduces lead time risk on Schneider components with variable stock levels
  • Volume and project pricing — multi-unit orders for multi-stage PFC arrays or OEM panel builds can be quoted with volume consideration; contact the team directly for project quantities

At-a-Glance Summary

  • Rated at 63 kVAR at 400/415V 50Hz — correct for mid-range three-phase industrial power factor correction systems with 200–600 kW motor loads
  • 220V AC 50/60Hz coil — must be verified against available control supply before ordering; M7 suffix in model number denotes this coil voltage
  • AC-6b operating category — specifically validated for capacitive and resistive load switching; not interchangeable with AC-3 or AC-4 motor-duty contactors
  • 3-pole, 3 NO contact configuration — all three phases switch simultaneously; no auxiliary contacts on the base model
  • Maximum circuit voltage of 690V AC — suitable for 208V, 277V, 347V, 400V, and 480V power systems
  • Screw clamp terminals on standard 35mm DIN rail — fits existing TeSys-based panel layouts without redesign
  • Part of the Schneider Electric TeSys LC1D.K / TeSys Deca family — multiple kVAR and coil voltage variants available for smaller or larger banks and alternate control supplies
  • Typical lead time 1–2 weeks in stock, 2–4 weeks on backorder — verify current availability with distributor before finalizing project schedule
  • No integrated circuit breaker — upstream overcurrent protection device required in the power circuit

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